EmbeddedViewRef

Class Description

Represents an Angular View.

A View is a fundamental building block of the application UI. It is the smallest grouping of Elements which are created and destroyed together.

Properties of elements in a View can change, but the structure (number and order) of elements in a View cannot. Changing the structure of Elements can only be done by inserting, moving or removing nested Views via a ViewContainerRef. Each View can contain many View Containers.

Example

Given this template...

Count: {{items.length}}
<ul>
  <li *ngFor="let  item of items">{{item}}</li>
</ul>

We have two TemplateRefs:

Outer TemplateRef:

Count: {{items.length}}
<ul>
  <template ngFor let-item [ngForOf]="items"></template>
</ul>

Inner TemplateRef:

<li>{{item}}</li>

Notice that the original template is broken down into two separate TemplateRefs.

The outer/inner TemplateRefs are then assembled into views like so:

<!-- ViewRef: outer-0 -->
Count: 2
<ul>
  <template view-container-ref></template>
  <!-- ViewRef: inner-1 --><li>first</li><!-- /ViewRef: inner-1 -->
  <!-- ViewRef: inner-2 --><li>second</li><!-- /ViewRef: inner-2 -->
</ul>
<!-- /ViewRef: outer-0 -->